add skeleton functions for write_ctl with documentation, tweak users table

self is always first in users list; implement logout

fix typos and tested writing to ctl from uxn. it works!

fix README

implement users table and users_read()

fixed a typo

update DESIGN document, put skeleton code in place

we can write to ctl; thanks sigrid :)

trying to write to ctl file

serve simple file directories over 9p

writerf(): write data to ramfile from serverside

playing with ramfs implemenatation

design notes on 9p directory structure

remove old files on build; fix fsread() a little bit; add options for different service models

first commit -- hello from 9p